[MC-134816] Crash: Exception ticking world entities

(18w30a) crash-2018-07-25_11.47.19-server.txt

Description: Exception ticking world entities

java.lang.ArrayIndexOutOfBoundsException: -1
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet.fixPointers(ObjectLinkedOpenHashSet.java:851)
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet$SetIterator.remove(ObjectLinkedOpenHashSet.java:1057)
	at axu.l(SourceFile:1118)
	at tc.l(SourceFile:493)
	at net.minecraft.server.MinecraftServer.b(SourceFile:736)
	at net.minecraft.server.MinecraftServer.a(SourceFile:661)
	at dfz.a(SourceFile:158)
	at net.minecraft.server.MinecraftServer.run(SourceFile:564)
	at java.lang.Thread.run(Thread.java:745)